Question

which term describes the process of sister chromatids not separating at the centromere during cell division?
○ karyokinesis
○ nondisjunction
○ desegregation
○ aneuploidy

Explanation:

• Karyokinesis: Refers to the division of the nucleus during cell division, not specifically about sister chromatids not separating.
• Nondisjunction: This is the process where sister chromatids (in mitosis or meiosis II) or homologous chromosomes (in meiosis I) fail to separate at the centromere during cell division.
• Desegregation: This is not a standard term used in the context of cell - division errors related to chromatid or chromosome separation.
• Aneuploidy: Refers to an abnormal number of chromosomes in a cell (e.g., monosomy or trisomy), which can be a result of nondisjunction, but it is not the term for the process of non - separation itself.

Answer:

B. nondisjunction